Forming Chondrites in a Solar Nebula with Magnetically Induced Turbulence

Abstract

Chondritic meteorites provide valuable opportunities to investigate the origins of the solar system. We explore impact jetting as a mechanism of chondrule formation and subsequent pebble accretion as a mechanism of accreting chondrules onto parent bodies of chondrites, and investigate how these two processes can account for the currently available meteoritic data. We find that when the solar nebula is $\le 5$ times more massive than the minimum-mass solar nebula at $a\simeq 2-3$ AU and parent bodies of chondrites are $\le 10^{24}$ g ($\le$ 500 km in radius) in the solar nebula, impact jetting and subsequent pebble accretion can reproduce a number of properties of the meteoritic data. The properties include the present asteroid belt mass, the formation timescale of chondrules, and the magnetic field strength of the nebula derived from chondrules in Semarkona. Since this scenario requires a first generation of planetesimals that trigger impact jetting and serve as parent bodies to accrete chondrules, the upper limit of parent bodies' masses leads to the following implications: primordial asteroids that were originally $\ge 10^{24}$ g in mass were unlikely to contain chondrules, while less massive primordial asteroids likely had a chondrule-rich surface layer. The scenario developed from impact jetting and pebble accretion can therefore provide new insights into the origins of the solar system.

Title are modified and typographical errors are corrected, following the published version; 6 pages, 2 figures, 1 table, accepted for publication in ApJ Letters

References in corpus (9)

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Cited by in corpus (10)

• Magnetically Induced Disk Winds and Transport in the HL Tau Disk
• Jetting during oblique impacts of spherical impactors
• Planetesimal collisions as a chondrule forming event
• Compound chondrule formation in optically thin shock waves
• Chondrules from high-velocity collisions: thermal histories and the agglomeration problem
• Formation of rims around chondrules via porous aggregate accretion
• Aggregate Growth and Internal structures of Chondrite Parent Bodies Forming from Dense Clumps
• Abundances of ordinary chondrites in thermally evolving planetesimals
• The Properties of Planetesimal Collisions under Jupiter's Perturbation and the Application to Chondrule Formation via Impact Jetting
• Chondrule Accretion with a Growing Protoplanet